Radical, patented new design to comfortably position the foot for treatment of plantar fasciitis, achilles tendonitis, and painful night muscle cramps. Made of cool, breathable foam material, this night splint is lightweight with less bulk than other night splint devices for superior comfort. Inner shell provides lateral side support with an opening at the ankle to prevent irritation on the ankle bone. Hinge adjusts the amount of dorsiflexion from 0 to 10 degrees, and a built-in toe wedge gives an additional 5 degree plane for even greater stretch across the plantar fascia. Easy and quick to apply and comfortable enough to sleep in. Non-slip bottom helps prevent slipping on flooring -- intended for sleeping, NOT FOR WALKING. Color: Black. Size according to shoe size. Foot specific, order Right or Left. Small fits Men's Shoe 6 1/2 and Under or Women's Shoe 7 1/2 and Under. Medium fits Men's Shoe 7 - 10 or Women's Shoe 8-11 1/2. Large fits Men's Shoe 11 - 13 or Women's Shoe 12 and Up. Note: Contagions are real. For hygiene reasons foot products are not returnable once removed from sealed plastic packaging.